The Idea
Up to now, when producing high quality large-format
prints it was necessary at first to make a contact from the color
separations then enlarge onto final size films. After the development
they had to be corrected, mounted and afterwards the plates or screens
were exposed. With the Proka Direct Projection System you can combine
all mentioned separate process to one single process and expose straight
from the color separation onto the plate or screen.
The camera system
The Proka mainly consists of three elements: the
camera itself with the optical system, the projection window and
electronic unit. Right opposite the camera there is the holding system
for the plates or screens that are to be exposed. High precision guide
rails enable the most exact positioning of the enlargement. With the
computer assisted controller unit once adjusted and saved data can
always be reused.
The optical system
The optical system consists of the lens, diffusion and
lamp system as well as the film positioning area in the projection
window. These parts have been developed by Proditec and are produced
with highest precision. A highly efficient cooling system ensures always
cold film and positioning even under heavy exposure workload
circumstances.
Highly efficient light source
A 6 kW instant start-stop lamp not only ensures short
exposure times. A special feature also is the easy maintenance and
changing of the lamp, low cost for spare parts and low energy
requirements. The lamp only burns while exposing and therefore can have
a life of up to 10 000 exposures. A diagnostic system detects eventual
errors and display them.
The result
The result of this optic system is extreme contour
sharpness of dots and lines :
- Without visible distortion - Constant quality from
the center to the edge - Over the whole projection area
Specifications
| Camera model: |
400/280 |
400/360 |
640/510 |
| Magnification range*: |
4 - 15 x |
4 - 15 x |
4 - 10 x |
| Max. film range dimensions diagonal: |
270 mm |
340 mm |
500 mm |
| square **: |
190x190 mm |
240x240 mm |
300x400 mm |
| rectangular: |
155x220 mm |
210x270 mm |
300x400 mm |
| Optics/lens customs designed: |
400 mm |
400 mm |
640 mm |
| Light source special metal-halide: |
2,5 / 6 kW |
2,5 / 6 kW |
2,5 / 6 kW |
| Approximate weight: |
1300 kg |
1400 kg |
1500 kg |
Maximum film dimensions
(film roll): |
760 mm
width, 10.000 mm long |
Maximum film dimensions
(film window): |
950 mm x
445 mm |
| Exposure time at 10x: |
Approx. 1
- 15 minutes |
| Focusing system: |
Auto Focus |
| Operation system: |
Computer
controlled/Motor driven, Infrared remote control |
| Power requirement: |
220-240 V,
AC 1Ph/32 Amp., Zero, Ground |
| Vacuum or compressed air: |
260 l/min
at 6 bar for the camera
320 l/min at 6 bar for the projection board |
* Other magnifications on request
** Dimensions and technical data may be changed according to customers
specification.
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